Android微信支付SDK开发

准备工作

开发平台及SDK下载

微信开放平台申请APP:https://open.weixin.qq.com

微信支付SDK及Demo下载:http://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=11_1

创建应用

创建移动应用获取AppIDAppSecret

要获取支付功能还需要开发者资质认证,300RMB/年的费用,貌似是开放平台中唯一要收费的

AndroidMainfest文件修改

配置权限

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<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

业务流程

商户系统和微信支付系统主要交互说明:

步骤1:用户在商户APP中选择商品,提交订单,选择微信支付。

步骤2:商户后台收到用户支付单,调用微信支付统一下单接口。参见【统一下单API】。

步骤3:统一下单接口返回正常的prepay_id,再按签名规范重新生成签名后,将数据传输给APP。参与签名的字段名为appIdpartnerIdprepayIdnonceStrtimeStamppackage。注意:package的值格式为Sign=WXPay

步骤4:商户APP调起微信支付。api参见本章节【App端开发步骤说明

步骤5:商户后台接收支付通知。api参见【支付结果通知API

步骤6:商户后台查询支付结果。api参见【查询订单API

开发

注册应用

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final IWXAPI msgApi = WXAPIFactory.createWXAPI(this, null);
msgApi.registerApp(Constants.APP_ID);

调用支付统一下单接口,并返回PrepayID

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private class GetPrepayIdTask extends AsyncTask<Void, Void, Map<String,String>> {

private ProgressDialog dialog;

@Override
protected void onPreExecute() {
dialog = ProgressDialog.show(PayActivity.this, getString(R.string.app_tip), getString(R.string.getting_prepayid));
}

@Override
protected void onPostExecute(Map<String, String> result) {
if (dialog != null) {
dialog.dismiss();
}
sb.append("prepay_id\n" + result.get("prepay_id") + "\n\n");
show.setText(sb.toString());
unifiedorderResult = result;
}

@Override
protected void onCancelled() {
super.onCancelled();
}

@Override
protected Map<String,String> doInBackground(Void... params) {
String url = String.format("https://api.mch.weixin.qq.com/pay/unifiedorder");
String entity = genProductArgs();
Log.e("orion", entity);
byte[] buf = Util.httpPost(url, entity);
String content = new String(buf);
Log.e("orion", content);
Map<String,String> xml = decodeXml(content);
return xml;
}
}

设置统一下单参数:

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private String genProductArgs() {
StringBuffer xml = new StringBuffer();
try {
String nonceStr = genNonceStr();
xml.append("</xml>");
List<NameValuePair> packageParams = new LinkedList<NameValuePair>();
packageParams.add(new BasicNameValuePair("appid", Constants.APP_ID));
packageParams.add(new BasicNameValuePair("body", "APP pay test"));
packageParams.add(new BasicNameValuePair("mch_id", Constants.MCH_ID));
packageParams.add(new BasicNameValuePair("nonce_str", nonceStr));
packageParams.add(new BasicNameValuePair("notify_url", "http://www.yezhou.cc/callback/notify.php"));
packageParams.add(new BasicNameValuePair("out_trade_no", genOutTradNo()));
packageParams.add(new BasicNameValuePair("spbill_create_ip", "127.0.0.1"));
packageParams.add(new BasicNameValuePair("total_fee", "1"));
packageParams.add(new BasicNameValuePair("trade_type", "APP"));

String sign = genPackageSign(packageParams);
packageParams.add(new BasicNameValuePair("sign", sign));
String xmlstring =toXml(packageParams);
return xmlstring;
} catch (Exception e) {
Log.e(TAG, "genProductArgs fail, ex = " + e.getMessage());
return null;
}
}

设置PayReq请求的参数,并发送支付请求

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//设置PayReq请求的参数
private void genPayReq() {
req.appId = Constants.APP_ID;
req.partnerId = Constants.MCH_ID;
req.prepayId = unifiedorderResult.get("prepay_id");
req.packageValue = "prepay_id=" + unifiedorderResult.get("prepay_id");
req.nonceStr = genNonceStr();
req.timeStamp = String.valueOf(genTimeStamp());

List<NameValuePair> signParams = new LinkedList<NameValuePair>();
signParams.add(new BasicNameValuePair("appid", req.appId));
signParams.add(new BasicNameValuePair("noncestr", req.nonceStr));
signParams.add(new BasicNameValuePair("package", req.packageValue));
signParams.add(new BasicNameValuePair("partnerid", req.partnerId));
signParams.add(new BasicNameValuePair("prepayid", req.prepayId));
signParams.add(new BasicNameValuePair("timestamp", req.timeStamp));

req.sign = genAppSign(signParams);
sb.append("sign\n" + req.sign + "\n\n");
show.setText(sb.toString());
Log.e("orion", signParams.toString());
}
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//发送请求
msgApi.sendReq(req);

处理结果回调

实现微信API的IWXAPIEventHandler接口

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api.handleIntent(getIntent(), new IWXAPIEventHandler);

IWXAPIEventHandleronResp(BaseResp resp)中处理请求回调

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@Override
public void onResp(BaseResp resp) {
Log.d(TAG, "onPayFinish, errCode = " + resp.errCode);

if (resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) {
//处理PayReq的回调
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.app_tip);
builder.setMessage(getString(R.string.pay_result_callback_msg, resp.errStr + ";code=" + String.valueOf(resp.errCode)));
builder.show();
}
}

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